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*/ |
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package jsr166y; |
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import java.util.*; |
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|
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import java.util.concurrent.*; |
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import java.util.concurrent.locks.*; |
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import java.util.concurrent.atomic.*; |
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import sun.misc.Unsafe; |
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import java.lang.reflect.*; |
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|
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import java.util.ArrayList; |
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import java.util.Arrays; |
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import java.util.Collection; |
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import java.util.Collections; |
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import java.util.List; |
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import java.util.concurrent.locks.Condition; |
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import java.util.concurrent.locks.LockSupport; |
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import java.util.concurrent.locks.ReentrantLock; |
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import java.util.concurrent.atomic.AtomicInteger; |
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import java.util.concurrent.atomic.AtomicLong; |
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|
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/** |
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* An {@link ExecutorService} for running {@link ForkJoinTask}s. A |
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* Common code for execute, invoke and submit |
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*/ |
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private <T> void doSubmit(ForkJoinTask<T> task) { |
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if (task == null) |
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throw new NullPointerException(); |
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if (isShutdown()) |
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throw new RejectedExecutionException(); |
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if (workers == null) |
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// AbstractExecutorService methods |
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|
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public void execute(Runnable task) { |
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doSubmit(new AdaptedRunnable<Void>(task, null)); |
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ForkJoinTask<?> job; |
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if (task instanceof ForkJoinTask<?>) // avoid re-wrap |
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job = (ForkJoinTask<?>) task; |
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else |
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job = new AdaptedRunnable<Void>(task, null); |
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doSubmit(job); |
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} |
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|
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public <T> ForkJoinTask<T> submit(Callable<T> task) { |
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} |
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|
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public ForkJoinTask<?> submit(Runnable task) { |
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< |
ForkJoinTask<Void> job = new AdaptedRunnable<Void>(task, null); |
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> |
ForkJoinTask<?> job; |
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> |
if (task instanceof ForkJoinTask<?>) // avoid re-wrap |
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> |
job = (ForkJoinTask<?>) task; |
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else |
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> |
job = new AdaptedRunnable<Void>(task, null); |
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doSubmit(job); |
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return job; |
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} |
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|
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/** |
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* Submits a ForkJoinTask for execution. |
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* |
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* @param task the task to submit |
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* @return the task |
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* @throws RejectedExecutionException if the task cannot be |
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* scheduled for execution |
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* @throws NullPointerException if the task is null |
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*/ |
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public <T> ForkJoinTask<T> submit(ForkJoinTask<T> task) { |
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doSubmit(task); |
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return task; |
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} |
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|
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/** |
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* Adaptor for Runnables. This implements RunnableFuture |
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* to be compliant with AbstractExecutorService constraints. |
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*/ |
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return new AdaptedCallable<T>(callable); |
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} |
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|
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// Unsafe mechanics |
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|
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< |
// Temporary Unsafe mechanics for preliminary release |
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< |
private static Unsafe getUnsafe() throws Throwable { |
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try { |
| 1884 |
< |
return Unsafe.getUnsafe(); |
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< |
} catch (SecurityException se) { |
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< |
try { |
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< |
return java.security.AccessController.doPrivileged |
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< |
(new java.security.PrivilegedExceptionAction<Unsafe>() { |
| 1889 |
< |
public Unsafe run() throws Exception { |
| 1890 |
< |
return getUnsafePrivileged(); |
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< |
}}); |
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< |
} catch (java.security.PrivilegedActionException e) { |
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< |
throw e.getCause(); |
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< |
} |
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< |
} |
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< |
} |
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< |
|
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< |
private static Unsafe getUnsafePrivileged() |
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throws NoSuchFieldException, IllegalAccessException { |
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Field f = Unsafe.class.getDeclaredField("theUnsafe"); |
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< |
f.setAccessible(true); |
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< |
return (Unsafe) f.get(null); |
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< |
} |
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< |
|
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< |
private static long fieldOffset(String fieldName) |
| 1873 |
< |
throws NoSuchFieldException { |
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< |
return UNSAFE.objectFieldOffset |
| 1875 |
< |
(ForkJoinPool.class.getDeclaredField(fieldName)); |
| 1876 |
< |
} |
| 1877 |
< |
|
| 1878 |
< |
static final Unsafe UNSAFE; |
| 1879 |
< |
static final long eventCountOffset; |
| 1880 |
< |
static final long workerCountsOffset; |
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< |
static final long runControlOffset; |
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< |
static final long syncStackOffset; |
| 1883 |
< |
static final long spareStackOffset; |
| 1884 |
< |
|
| 1885 |
< |
static { |
| 1886 |
< |
try { |
| 1887 |
< |
UNSAFE = getUnsafe(); |
| 1888 |
< |
eventCountOffset = fieldOffset("eventCount"); |
| 1889 |
< |
workerCountsOffset = fieldOffset("workerCounts"); |
| 1890 |
< |
runControlOffset = fieldOffset("runControl"); |
| 1891 |
< |
syncStackOffset = fieldOffset("syncStack"); |
| 1892 |
< |
spareStackOffset = fieldOffset("spareStack"); |
| 1893 |
< |
} catch (Throwable e) { |
| 1894 |
< |
throw new RuntimeException("Could not initialize intrinsics", e); |
| 1895 |
< |
} |
| 1896 |
< |
} |
| 1881 |
> |
private static final sun.misc.Unsafe UNSAFE = getUnsafe(); |
| 1882 |
> |
private static final long eventCountOffset = |
| 1883 |
> |
objectFieldOffset("eventCount", ForkJoinPool.class); |
| 1884 |
> |
private static final long workerCountsOffset = |
| 1885 |
> |
objectFieldOffset("workerCounts", ForkJoinPool.class); |
| 1886 |
> |
private static final long runControlOffset = |
| 1887 |
> |
objectFieldOffset("runControl", ForkJoinPool.class); |
| 1888 |
> |
private static final long syncStackOffset = |
| 1889 |
> |
objectFieldOffset("syncStack",ForkJoinPool.class); |
| 1890 |
> |
private static final long spareStackOffset = |
| 1891 |
> |
objectFieldOffset("spareStack", ForkJoinPool.class); |
| 1892 |
|
|
| 1893 |
|
private boolean casEventCount(long cmp, long val) { |
| 1894 |
|
return UNSAFE.compareAndSwapLong(this, eventCountOffset, cmp, val); |
| 1905 |
|
private boolean casBarrierStack(WaitQueueNode cmp, WaitQueueNode val) { |
| 1906 |
|
return UNSAFE.compareAndSwapObject(this, syncStackOffset, cmp, val); |
| 1907 |
|
} |
| 1908 |
+ |
|
| 1909 |
+ |
private static long objectFieldOffset(String field, Class<?> klazz) { |
| 1910 |
+ |
try { |
| 1911 |
+ |
return UNSAFE.objectFieldOffset(klazz.getDeclaredField(field)); |
| 1912 |
+ |
} catch (NoSuchFieldException e) { |
| 1913 |
+ |
// Convert Exception to corresponding Error |
| 1914 |
+ |
NoSuchFieldError error = new NoSuchFieldError(field); |
| 1915 |
+ |
error.initCause(e); |
| 1916 |
+ |
throw error; |
| 1917 |
+ |
} |
| 1918 |
+ |
} |
| 1919 |
+ |
|
| 1920 |
+ |
/** |
| 1921 |
+ |
* Returns a sun.misc.Unsafe. Suitable for use in a 3rd party package. |
| 1922 |
+ |
* Replace with a simple call to Unsafe.getUnsafe when integrating |
| 1923 |
+ |
* into a jdk. |
| 1924 |
+ |
* |
| 1925 |
+ |
* @return a sun.misc.Unsafe |
| 1926 |
+ |
*/ |
| 1927 |
+ |
private static sun.misc.Unsafe getUnsafe() { |
| 1928 |
+ |
try { |
| 1929 |
+ |
return sun.misc.Unsafe.getUnsafe(); |
| 1930 |
+ |
} catch (SecurityException se) { |
| 1931 |
+ |
try { |
| 1932 |
+ |
return java.security.AccessController.doPrivileged |
| 1933 |
+ |
(new java.security |
| 1934 |
+ |
.PrivilegedExceptionAction<sun.misc.Unsafe>() { |
| 1935 |
+ |
public sun.misc.Unsafe run() throws Exception { |
| 1936 |
+ |
java.lang.reflect.Field f = sun.misc |
| 1937 |
+ |
.Unsafe.class.getDeclaredField("theUnsafe"); |
| 1938 |
+ |
f.setAccessible(true); |
| 1939 |
+ |
return (sun.misc.Unsafe) f.get(null); |
| 1940 |
+ |
}}); |
| 1941 |
+ |
} catch (java.security.PrivilegedActionException e) { |
| 1942 |
+ |
throw new RuntimeException("Could not initialize intrinsics", |
| 1943 |
+ |
e.getCause()); |
| 1944 |
+ |
} |
| 1945 |
+ |
} |
| 1946 |
+ |
} |
| 1947 |
|
} |
